Influence of shock-wave action on the critical current of bismuth (2223) first-generation HTSC ribbons

摘要

An experiment was conducted to demonstrate the influence of shock-wave action on the critical current of bismuth (2223) first-generation HTSC ribbons. Experiments were performed using a Tyul'pan electric discharge installation plasma focus (PF). Shock waves were generated when the cumulative plasma flow generated with the plasma flux, which was generated upon pinching the current-plasma shell on the axis of the PF installation, impacted the target material. The target was a wafer 160-360 μm thick made from a refractory material. Experiments were performed with an energy of 4 kJ stored in the capacitor battery of the PF installation. As the magnetic field increases to 3.0-3.5 T, the critical current for all the samples decreases and becomes closer. The experiments showed that it is possible to increase substantially the critical current density in superconducting ribbons 1G due to plasma percussion.